Proteins are polymers whose basic chemical units are called:
a. amino acids.
b. polysaccharides.
c. lipids.
d. cellulose.
e. nucleosides.
A
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Match the specialized sense to the role it plays.
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Which of the following observations led to Darwin's major inferences?
a. Members of a population vary in their heritable traits b. Body parts that are not used deteriorate over time c. Organisms only go extinct when catastrophes occur d. Although organisms can produce huge numbers of offspring, many of these offspring do not survive e. The first and fourth answers are correct
During secondary succession, ecosystems are able to reestablish themselves after a devastating event. Which of these events most likely will lead to primary succession?
A) forest fire B) volcanic eruption C) earthquake D) flood
During gastrulation, three tissue layers form: the outer __________, the inner __________, and the __________ in between the first two layers.
Fill in the blank(s) with the appropriate word(s).